Note 8 - Commitments and Contingencies (Tables)

9 Months Ended

Sep. 30, 2020

Notes Tables

Lease, Cost [Table Text Block]

Lease Costs	Three Months Ended September 30,						Nine Months Ended September 30,
	2020			2019			2020			2019
Operating lease cost	$	212		$	273		$	726		$	861
Sublease income		(105	)		(158	)		(421	)		(474	)
Net lease cost	$	107		$	115		$	305		$	387
Other information
Operational cash flow used for operating leases	$	236		$	322		$	816		$	970

	September 30,
	2020			2019
Weighted-average remaining lease term (in years)		1.5			1.8
Weighted-average discount rate		12	%		12	%

Lessee, Operating Lease, Liability, Maturity [Table Text Block]

Remaining in 2020	$	111
2021		454
2022		88
Thereafter		—
Total future minimum lease payments		653
Less imputed interest		(56	)
Total	$	597
Reported as:
Operating lease liabilities	$	400
Operating lease liabilities- non-current		197
Total	$	597

TLF Bio Innovation, Related Party Warrants [Member]

Notes Tables

Fair Value, Assets and Liabilities Measured on Nonrecurring Basis, Valuation Techniques [Table Text Block]

Assumption	As of September 30, 2020
Stock price	$	0.73
Expected equity volatility		89	%
Risk-free interest rate		0.09	%
Expected term (in days)		71

Assumption	As of September 30, 2020
Expected equity volatility		136	%
Risk-free interest rate		0.28	%
Expected term (in years)		5.00
Weighted-average fair value of warrants	$	0.64